46 lines
1.4 KiB
Diff
46 lines
1.4 KiB
Diff
From 39c7ed837bf1d6b5b45fd870bbdb15870c76b87f Mon Sep 17 00:00:00 2001
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From: Olivier Fourdan <ofourdan@redhat.com>
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Date: Thu, 28 Nov 2024 14:09:04 +0100
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Subject: [PATCH xserver 05/13] xkb: Fix buffer overflow in
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XkbChangeTypesOfKey()
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If XkbChangeTypesOfKey() is called with nGroups == 0, it will resize the
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key syms to 0 but leave the key actions unchanged.
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If later, the same function is called with a non-zero value for nGroups,
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this will cause a buffer overflow because the key actions are of the wrong
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size.
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To avoid the issue, make sure to resize both the key syms and key actions
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when nGroups is 0.
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CVE-2025-26597, ZDI-CAN-25683
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
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Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
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(cherry picked from commit 0e4ed94952b255c04fe910f6a1d9c852878dcd64)
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Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1831>
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---
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xkb/XKBMisc.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/xkb/XKBMisc.c b/xkb/XKBMisc.c
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index 0a3b5cbc7..4e89b5bdf 100644
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--- a/xkb/XKBMisc.c
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+++ b/xkb/XKBMisc.c
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@@ -552,6 +552,7 @@ XkbChangeTypesOfKey(XkbDescPtr xkb,
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i = XkbSetNumGroups(i, 0);
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xkb->map->key_sym_map[key].group_info = i;
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XkbResizeKeySyms(xkb, key, 0);
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+ XkbResizeKeyActions(xkb, key, 0);
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return Success;
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}
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--
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2.48.1
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